package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定区间内营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", 5);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null? 0.0 : turnover;
            turnoverList.add(turnover);

        }


        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 统计指定区间内用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //每天新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        //截至到当天的总用户数量
        List<Integer> totalUserList = new ArrayList<>();

        dateList.forEach(date -> {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();

            map.put("end", endTime);
            Integer totalcount = userMapper.countByMap(map);
            newUserList.add(totalcount);
            map.put("begin", beginTime);
            Integer newcount = userMapper.countByMap(map);
            totalUserList.add(newcount);
        });
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 订单统计统计
     * @param begin
     * @param end
     * @return OrderReportVO
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        Integer totalOrderCount = 0;
        Integer validOrderCount = 0;
        Double orderCompletionRate = 0.0;

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            // 查询每天的订单总数
            Integer totalcount = orderMapper.countByMap(map);
            totalcount = totalcount == null? 0 : totalcount;
            orderCountList.add(totalcount);
            //查询每天的有效订单数
            map.put("status", Orders.COMPLETED);
            Integer validcount = orderMapper.countByMap(map);
            validcount = validcount == null? 0 : validcount;
            validOrderCountList.add(validcount);
            totalOrderCount =  totalOrderCount + totalcount;
            validOrderCount = validOrderCount + validcount;
        }
        if (totalOrderCount > 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount.doubleValue();
        }

        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();

    }

    /**
     * 销量排行top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        return SalesTop10ReportVO.builder().nameList(nameList).numberList(numberList).build();
    }

    @Override
    public void exportBusinessData(HttpServletResponse response){
        //1. 查询数据库，获取营业数据--最近30天
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        //基于模板文件创建一个新的Excel文件
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //填充数据
            XSSFSheet sheet = excel.getSheetAt(0);
            sheet.getRow(1).getCell(1).setCellValue("时间"+dateBegin + "至" + dateEnd);

            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());


            List<LocalDate> dateList = new ArrayList<>();
            dateList.add(dateBegin);
            while (!dateBegin.equals(dateEnd)){
                dateBegin = dateBegin.plusDays(1);
                dateList.add(dateBegin);
            }
            int rowIndex = 7;
            for (LocalDate date : dateList) {

                LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
                LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
                businessDataVO = workspaceService.getBusinessData(beginTime, endTime);

                XSSFRow row1 = sheet.getRow(rowIndex);
                row1.getCell(1).setCellValue(date.toString());
                row1.getCell(2).setCellValue(businessDataVO.getTurnover());
                row1.getCell(3).setCellValue(businessDataVO.getValidOrderCount());
                row1.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
                row1.getCell(5).setCellValue(businessDataVO.getUnitPrice());
                row1.getCell(6).setCellValue(businessDataVO.getNewUsers());
                rowIndex++;
            }

            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            out.close();
            excel.close();

        } catch (IOException e) {
            e.printStackTrace();
        }

        //通过输出流将Excel文件下载到客户端浏览器

    }
}
